Recent content by iseidthat

ok... 285 Cal=285,000 cal (4.186)= 1.19e6 J how do i relate it to time though? do i just divide it by the power? 1.19e6/67=17806 s/60/60=4.95 h ok thanks

Homework Statement If a person radiates about 67 W of power at room temperature, how long does it take (h) for a person to radiate away the energy acquired by consuming a 285 Calorie donut? Homework Equations i know W=J/s no clue, i need one that involves time. The Attempt at a...

P=F/A so 1.85(38)=F=70.014 kN Thanks!

P1-P2=(1/2)(1.29)(104^2)-(1/2)(1.29)(117^2) P1-P2=-1853.09 pa well a change would be possitive. that seems kinda large for having only a difference of 13 m/s.

P1+(1/2)pv1^2+pgy1=P2+(1/2)pv2^2+pgy2 what would you put as the y's? if you ignored it, would the pgy's cancel? i guess you could do P1-P2=(1/2)pv2^2-(1/2)pv1^2+pgy2-pgy1

Homework Statement (a) Find the pressure difference on an airplane wing where air flows over the upper surface with a speed of 117 m/s, and along the bottom surface with a speed of 104 m/s. (b) If the area of the wing is 38 m2, what is the net upward force exerted on the wing...

Homework Statement What is the acceleration of a rising hot-air balloon if the ratio of the air density outside the balloon to that inside is 1.30? Neglect the mass of the balloon fabric and the basket. Homework Equations g=9.81 m/s^s The Attempt at a Solution I thought it would...

i figured it out. thanks :)

i fixed the problems and hopefully they are right. i found the mass flow rate and also the volumetric flow rate. we haven't learned about pensity in our class yet...so there has to be a different way.

Homework Statement To fill a child's inflatable wading pool you use a garden hose with a diameter of 2.8 cm. Water flows from this hose with a speed of 1.1 m/s. How long will it take to fill the pool to a depth of 32 cm if it is circular and has a diameter of 2.7 m? Homework Equations delta...

ohhh its a circular window! ahah i misread it. so the area of a circle : A=pi r^2=pi(.1m)^2=.031416 m^2 so F= 1.06 e 8 x .031416 =3.33 e 6 mmmk thanks :)

well F=P x A...but i don't have the area... i know radius is 0.1 m, but i don't know the other dimensions.

Homework Statement In this problem, please make sure to use the density of seawater = 1025 kg/m3. The bottom of the Mariana Trench, located in the Pacific Ocean, is about 11,000 m below the ocean's surface, making it the deepest ocean depth on Earth. If an underwater vehicle were exploring...

I did a lab that involved elastic equations and this site helped me visualized some of the problems. I hope it helps: http://hyperphysics.phy-astr.gsu.edu/Hbase/colsta.html

Homework Statement An airtight box has a removable (massless) lid of area 4·10-2 m2. A lid is placed on it while it is on top of a mountain (where Patm=0.81·105 Pa). It is then taken to sea level, where Patm = 1.013·105 Pa. How much force will be required to remove the lid? Homework...